linux-kernel - Re: Swappiness vs. mmap() and interactive response

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Date:	Wed, 29 Apr 2009 16:47:18 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Theodore Tso <tytso@....edu>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Elladan <elladan@...imo.com>, linux-kernel@...r.kernel.org,
	linux-mm <linux-mm@...ck.org>, Rik van Riel <riel@...hat.com>
Subject: Re: Swappiness vs. mmap() and interactive response

>> Mapped page decrease rapidly: not happend (I guess, these page stay in
>>                                           active list on my system)
>> page fault large latency:     happend (latencytop display >200ms)
>
> hm.  The last two observations appear to be inconsistent.

it mean existing process don't slow down. but new process creation is very slow.


> Elladan, have you checked to see whether the Mapped: number in
> /proc/meminfo is decreasing?
>
>>
>> Then, I don't doubt vm replacement logic now.
>> but I need more investigate.
>> I plan to try following thing today and tommorow.
>>
>>  - XFS
>>  - LVM
>>  - another io scheduler (thanks Ted, good view point)
>>  - Rik's new patch
>
> It's not clear that we know what's happening yet, is it?  It's such a
> gross problem that you'd think that even our testing would have found
> it by now :(

Yes, unclear. but various testing can drill down the reason, I think.


> Elladan, do you know if earlier kernels (2.6.26 or thereabouts) had
> this severe a problem?
>
> (notes that we _still_ haven't unbusted prev_priority)
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